Malicious PDF — malware analysis report

Static analysis result for SHA-256 1720ff9281b94c71…

MALICIOUS

PDF

70.6 KB Created: 2021-02-16 05:46:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: e98fe5ffc1b4a5246cf029771405a2f2 SHA-1: e8f816d043dcb5c46b526b1f087f0adafe3f888c SHA-256: 1720ff9281b94c71e030ffcd8e93baa6fb2f896d8d3ceefe907a4d511ae1fbfb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file is classified as malicious by multiple heuristics and an ML classifier. It contains numerous embedded URLs, with a critical finding indicating a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'intermediate algebra word problem solver', likely to entice users to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://yafferge.ru/strik?utm_term=intermediate+algebra+word+problem+solver In PDF document text
    • http://ketousa.site/vojusaditaratobedinomekbzdhu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491439/normal_601e819921db5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483856/normal_6006047ecfcc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476453/normal_601e67d82c743.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487413/normal_6013c7f37c3c6.pdfIn PDF document text
    • http://legionmone.xyz/mojudusogegutowaji3wbi7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486036/normal_5fd828e316778.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/GjdDxLo/40204677582.pdfIn PDF document text
    • https://cdn.sqhk.co/kosifodalab/RijRhGC/6111645472.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/wKjdgfO/hyperion_launcher_pro_apkpure.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412159/normal_602124e65320c.pdfIn PDF document text
    • http://uscarins.info/16630945442109c9.pdfIn PDF document text
    • http://negozio50sconto.info/barcode_font_free_code_128vo98j.pdfIn PDF document text
    • https://cdn.sqhk.co/devisojop/EDgcjc0/psiphon_pro_the_internet_freedom_vpn_indir.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gosete/fusafaxizozugepa.pdfIn PDF document text
    • http://xapopifatudafa.rf.gd/tebudilemegilipefi.pdfIn PDF document text
    • https://s3.amazonaws.com/fewifuwu/dufozufebefetas.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A1 5508 bytes
SHA-256: b22f5d53713cc642a50dbf2f40480212f1ce2dcd18e2e5058cf3f00bf23c3e2e
font_01_sfnt_off0000e954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE954 10520 bytes
SHA-256: 3ec10e33012252b58721c56b2389421ed2fe6e3c36703596bf0fa34ffdf9231f

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